Load an audio or video file, slow it down or speed it up without changing pitch, and loop any section between two points.
This tool runs entirely in your browser. What you enter is never sent anywhere.Your input is never sent anywhere.
DetailsAudio file
Playback speed (pitch stays the same)
A-B loop
TIP
Load a file to unlock speed control and the A-B loop.
Slow down music and repeat a section so you can learn it by ear
Learning a song by ear, checking a dance move, or catching a fast sentence in another language usually comes down to two things: playing it slower without changing the pitch, and repeating the one part you can't catch. This tool does both with a file on your device.
Speed runs from 0.25x to 2x in 0.05 steps, and your browser keeps the pitch where it is. Mark a start point (A) and an end point (B) and the tool jumps back to A every time playback reaches B, so you can listen to the same phrase as many times as you need.
For audio files you also get a waveform, which makes it easier to see where a phrase begins. Keyboard shortcuts cover play, seek, loop points, and speed. The file is played by your browser and is not uploaded by this tool.
Common uses: transcribing, dance practice, language study
Transcribing guitar, piano, or drums
Drop a fast solo or chord change to about 0.5x, loop two bars, and work out one note at a time against the waveform.
Checking dance moves
Load a video, slow a tricky eight-count to 0.5x–0.75x, and loop it until the order of steps and arm movements is clear.
Language listening and shadowing
Set the sentence you missed as the loop and replay it at 0.8x–0.9x, keeping the natural sound of the voice.
Learning a vocal line
Loop the phrase before the chorus and listen for where the singer breathes, holds a note, or changes the melody.
How to loop a section at half speed
- Drop an audio or video file onto the page, or tap the box to choose one (MP3, WAV, M4A, MP4, and so on).
- Pick a speed with the slider or a preset button, anywhere from 0.25x to 2x.
- Play to the start of the hard part and press Set loop start (A), then play to the end and press Set loop end (B).
- Turn on Loop. Drag the markers, use the ±0.1 s buttons, or switch on Zoom to loop to fine-tune the edges.
Note: Press Save loop to keep a section in the list so you can jump between several phrases of the same song. Saved loops disappear when you reload the page or load another file.
Browser limits and file handling
- Sound quality: speed changes use your browser's pitch preservation. At extreme speeds such as 0.25x, audio may sound muffled or slightly unnatural, and results differ between browsers.
- File support: which files play depends on the codecs your browser supports. Some video files may play without sound or not load at all. MP4 (H.264 + AAC) and MP3 are the safest formats.
- Memory only: the loaded file, loop points, and saved loops exist only in the page's memory and are cleared when you reload, close the tab, or load a new file.
- Waveform: it is drawn for audio files only, and only if your browser can decode the file. Video files use the plain timeline bar.
- Rights: use recordings you have the right to listen to. The tool can't save or export audio.
Which playback speed to use
These are starting points, not rules. Try 0.75x–0.9x first and go lower only for the parts you can't hear.
| Speed | Good for | What to expect |
|---|---|---|
| 0.25x | Checking a single fast note or ornament | Audio may sound less natural |
| 0.5x | Transcribing fast guitar solos and drum fills | Picking and timing are easy to hear |
| 0.75x | Learning complex choreography | Easier to follow the order of moves |
| 0.9x | Language listening and shadowing | Close to natural speech, with a little more room |
| 1.0x | Normal playback | Original speed of the file |
| 1.25x | Reviewing material you already know | Quicker run-through |
| 1.5x | Fast listening practice for lectures and podcasts | Takes concentration |
How to choose a speed
The slower the speed, the easier the details are to hear, but timing and feel can get lost. Listen at 1x first to get the whole phrase, slow down only for the bars that give you trouble, and finish with a pass at normal speed.
Tips for transcribing and practicing with a looper
A few habits that make slow-down and loop practice work better.
Pick the speed by the job
Use 1x to hear the whole phrase and about 0.5x only for the notes you can't make out.
If you listen slowly from the start, you can lose the rhythm and feel of the part. Get the overall shape first, then loop the hard bars at a lower speed.
Watch weight shifts and entry points in dance videos
At 0.5x–0.75x, look at when each move starts and where the weight shifts.
Looping the same eight counts shows the order of steps and small pauses that are easy to miss at full speed.
Set loop edges for sentence-length shadowing
Put A just before the sentence starts and B a beat after it ends.
Repeating it at 0.8x–0.9x lets you hear stress, intonation, and words that run together while the voice still sounds natural.
Leave a little room around the loop
A loop that starts exactly on the first note can cut off the attack. Start the loop a fraction early, then use the ±0.1 s buttons to trim it once the phrase sounds right.
Common practice mistakes and fixes
Practicing too slowly for too long
Staying at 0.25x makes the notes easy to hear, but you can lose the real tempo and feel. When you go back to normal speed, your timing is off.
💡 See the solution▼
Loop edges that cut off the first note
If A or B is set roughly, the first note or the move you want to study can fall outside the loop.
💡 See the solution▼
A video plays but has no sound, or won't load
Some files use an audio or video format that your browser can't decode, so you get a picture without sound or an error message.
💡 See the solution▼
Keyboard shortcuts stop responding
After you drag a slider, keys such as Space, A, and B seem to do nothing.
💡 See the solution▼
Losing your loops after a refresh
You reload the page by accident and the loop points and saved loops are gone.
💡 See the solution▼
Questions about pitch, file types, and privacy
Q.Is my audio or video file uploaded anywhere?
A. No. The tool plays the file from your own device using your browser, and it has no upload or save function, so the file is not sent to this site's server. The waveform is also generated in your browser.
Q.Does changing the speed change the pitch?
A. No. The tool turns on your browser's built-in pitch preservation (the preservesPitch setting) and changes only the playback rate, so notes stay in the same key. Because your browser does this processing, results vary by browser, and very slow speeds such as 0.25x may sound muffled or slightly unnatural.
Q.Which file types work?
A. Any audio or video file your browser can play. MP3, WAV, M4A, MP4, and WebM are common examples. The tool accepts files that your system labels as audio or video, but a file your browser can't decode will fail to play. MP4 with H.264 video and AAC audio is the safest choice.
Q.How do I loop a section (A-B repeat)?
A. Play or click to the start of the section and press Set loop start (A), then move to the end and press Set loop end (B). Turn on Loop, and playback jumps back to A each time it reaches B. You can drag the green A marker and red B marker on the timeline, or use the ±0.1 s buttons to move a point in small steps.
Q.What keyboard shortcuts are available?
A. Space plays or pauses. The left and right arrow keys skip 5 seconds (hold Shift for 1 second). A and B set the loop start and end at the current position, L turns the loop on or off, and [ and ] lower or raise the speed by 0.05x. Shortcuts work once a file is loaded, and they are ignored while a slider has focus.
Q.Are my loop points saved after I close the page?
A. No. Loop points and saved loops are kept only in the page's memory. Reloading the page, closing the tab, or loading a different file clears them. Use Save loop to keep several sections handy while you practice in the same session.
Q.Can I slow down a YouTube video or a Spotify song?
A. Not directly. This tool only plays files you load from your device. It can't open links or stream from other sites. If you already have the audio or video as a file you're allowed to use, load it here.
Q.Is it OK to practice with songs I bought?
A. Playing a recording you have the right to listen to, for your own practice, is the typical use. The tool doesn't save, convert, or export audio, so it can't be used to make copies. Copyright rules vary by country, so check yours before sharing anything. This is not legal advice.
Q.Why is there no waveform for my file?
A. A waveform is drawn only for audio files, and only when your browser can decode the file. For video files, or if decoding fails, you get the timeline bar without a waveform. Speed control and looping work either way.
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